Nonbreakable hemacytometer



H. W. GEORG E Dec. 15, 1931.

NONBREAKABLE HEMACYTOMETER Filed April 14, 1928 myM/Am 1 Patented Dec.15, 1931 PATENT OFFICE HARRY WILLIAIM GEORGE,

OF KENMORE, NEW YORK NONBREAKABLE nmmacyromnrna Application filed April14,

This invention relates to improvements in haemacytometers, the generalobject of the invention being to make the device of nonbreakablematerial, with means for removably holding the cover plate over thecounting chamber so that said plate is attached to the device and cannotfall therefrom and to provide adjustable supports for the plate.

This invention also consists in certain other features of constructionand in the combination and arrangement of the several parts, to behereinafter fully described, illustrated in the accompanying drawingsand specifically pointed out in the appended claims.

In describing my invention in detail, reference will be had to theaccompanying drawings wherein like characters denote like orcorresponding parts throughout the several views, and in which:

Figure 1 is a plan view showing one form of the invention.

Figure 2 is a section on line 2-2 of Figure 1.

Figure 3 is an edge view showing a modification.

Figure 4 is a section on line ure 3.

Figure 5 is a modification.

Figure 6 is a section on line 66 of Figure 5.

In these views, the numeral 1 indicates the slide or body of the devicewhich is formed of non-breakable material, such as bakelite, and thismaterial may be either transparent or opaque. If opaque material isused, openings, such as shown at 2 in Figure 4, must be provided forpermitting light to pass to the scales or rulings.

The usual counting chamber 3 is formed in the central part of the body,with the scale strips 4 formed on the bottom of the chamber. Portions ofthe side walls of the chamber are undercut to provide the overhangingparts 5 which act as guideways and holding means for the glass cover 6.I also provide supports 7 upon which the cover plate rests, thesesupports being preferably composed of headed screws 7 having theirthreaded portions placed in threaded holes partly in section,

44 of Figplan view showing a further 1928. Serial N0. 270,010.

8 formed in the bottom of the chamber, as shown in Figure 3, so that byadjusting these supports, the cover plate will be firmly held betweenthe parts 5 and the heads of the supports so that it will be prevented55 from falling out. of the chamber when the device is moved about,though said cover can be easily removed when necessary.

Figures 3 and 4 show the scale strip as composed of a strip of glass 4of dovetail c shape in cross section, held by friction in a dovetailshaped groove 9 formed in the central part of the counting chamber, thematerial from which the slide or body l is composed acting tofrictionally hold the glass strip in place, but permitting it to beremoved when necessary.

Figures 5 and 6 show the body 1 with the counting chamber formed on itsupper surface, withthe grooves 10 separating the 7 scale strip from therest of the top surface of the body. These figures also. show clips 11of metal or the like having portions of their lower parts forming thesupports 12 V for the cover glass, these supports being 7 adjustable bybending the material as desired, with the upper portions of the clipsbent over to form the guiding and holding means 13 which engage theedges of the cover glass. Of course, a counting'chamber so could be cutin the body 1' and these clips placed therein so that the clips and thecover glass would be below the surface of the slide. V i

' By making the device of non-breakable material, the frequent breakageof devices of this nature, when made of glass, is eliminated and thescales or rulings are more clearly visible when placed on bakelite orsimilar material than they are when placed onglass. The scales orrulings may be placed on the. strips which form integral parts of theslide or they may be placed on a strip which is removably carriedby theslide. j

The supports 7 are preferably composed of the same material from whichthe body of the device is formed. g

It is thought from the foregoing description that the advantages andnovel features 100 of my invention will be readily apparent.

It is to be understood that I may make changes in the construction andin the combination and arrangement of the several parts, provided thatsuch changes tall within the scope of the appended claims.

WVhat I claim is 1. A haemacytometer slide: having a recess thereincontaining a counting chamber, said recess opening out through one sideof the slide, parts extending inwardly from the upper portions of theside walls of the recess, supports extending upwardly from the bottom ofthe recess and a cover plate resting on the supports and having its sideportions extending under the inwardly extending parts, whereby the coverplate is held in position by said supports and the inwardly extendingparts.

2. A haemacytometer slide having a recess therein containing a countingchamber, said recess opening out through one side of the slide, partsextending inwardly from the upper portions of the side walls of therecess, supports extending upwardly from the bottom of the recess, acover plate resting on the supports and having its side portionsextending under the inwardly extending parts, whereby the cover plate isheld in position by said supports and the inwardly extending parts andsaid slide having an opening therein communicating with the bottom ofthe recess.

3. A haemacytometer slide having a recess therein containing a countingchamber, said recess opening out through one side of the slide, partsextending inwardly from the upper portions of the side walls of therecess, supports extending upwardly from the bottom of the recess, acover plate resting on the supports'and having its side portionsextending under the inwardly extending parts anld means for adjustingthe supports vertica 1}.

4:. A haemacytometer slide having a recess therein opening out throughthe sides of the slide, with the side walls of the recess undercut toform overhanging portions, supports extending upwardly from the bottomof the recess and a cover plate resting on the supports andextendingunder the overhanging portions, whereby the cover plate is heldin position by said overhanging parts and the supports.

5. A heemacytometer slide having a recess .therein opening. out throughthe sides of the slide, with the side walls of the recess undercut toform overhanging portions, adjustable supports extending upwardly fromthe bottom of the recess and a cover plate resting on the supports andextending under the overhanging portions, whereby the cover plate isheld in position by said overhanging parts and the supports.

6. A haemacytometer slide having a recess therein opening out throughthe sides of the slide, with the side walls of the recess undercut toform overhanging portions, adjustable supports extending upwardly fromthe bottom of the recess, a cover plate resting on the supports andextending under the overhanging portions, whereby the cover plate isheld in position by said overhanging parts and the supports and aremovable scale strip in said chamber.

7. A haemacytometer slide having a recess therein opening out throughthe sides of the slide, with the side walls of the recess undercut toform overhanging portions, adjustable supports extending upwardly fromthe bottom of the recess, a cover plate resting on the supports andextending under the overhanging portions, a removable scale strip insaid chamber and said slide having light openings therein communicatingwith the chamber.

In testimony whereof I aflix my signature.

HARRY WILLIAM GEORGE.

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